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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RM48L540DPGET датащи(PDF) 53 Page - Texas Instruments |
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RM48L540DPGET датащи(HTML) 53 Page - Texas Instruments |
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53 / 174 page  RM48L940, RM48L740, RM48L540 www.ti.com SPNS175C – APRIL 2012 – REVISED JUNE 2015 6.3 Power Sequencing and Power On Reset 6.3.1 Power-Up Sequence There is no timing dependency between the ramp of the VCCIO and the VCC supply voltage. The power- up sequence starts with the I/O voltage rising above the minimum I/O supply threshold, (see Table 6-4 for more details), core voltage rising above the minimum core supply threshold and the release of power-on reset. The high-frequency oscillator will start up first and its amplitude will grow to an acceptable level. The oscillator start up time is dependent on the type of oscillator and is provided by the oscillator vendor. The different supplies to the device can be powered up in any order. The device goes through the following sequential phases during power up. Table 6-3. Power-Up Phases Oscillator start-up and validity check 1032 oscillator cycles eFuse autoload 1180 oscillator cycles Flash pump power up 688 oscillator cycles Flash bank power up 617 oscillator cycles Total 3517 oscillator cycles The CPU reset is released at the end of the sequence in Table 6-3 and fetches the first instruction from address 0x00000000. Copyright © 2012–2015, Texas Instruments Incorporated System Information and Electrical Specifications 53 Submit Documentation Feedback |
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